$\frac{x^n\cdot n}{4^{n+1}}$
$\int z^3e^{z^4}dz$
$e^{x^2}=140$
$3x+2\cdot3x-1$
$-10x=-30$
$\sin\left(2x\right)\cos\left(x\right)-\sin\left(x\right)=\cos\left(2x\right)\sin\left(x\right)$
$\pi\cdot4.9^2\cdot9.8$
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